Atki 0 Posted July 29, 2014 Well here we are again. Back to square one. The car drove for one day. Started it up on Monday morning, reversed out, switched off to wait for my other half. Went to restart. Same old once again, turns over but will not catch. Have spent the last two days spraying cleaning every electrical connector in the engine bay. Have now changed the crank sensor to. Still no go. Managed to unscrew the ecu plug in the bay to separate it and have sprayed that countless times now. cleaned and sprayed the cam shaft sensor and plug .Cleaned and sprayed the ecu socket and wires. Still the same old. The engine tries to fire up and gets close but does not pick up. From then on it cranks over but does not even try to fire. Let it rest... does the same again. Am I missing something or is there something more serious to worry about? If possible can some one explain to me the start up process of the car what I mean is what needs to be working in order for it to fire up? There is definitely petrol getting to where it needs to be. When removed the brand new plugs are wet. Battery on constant trickle charge but shows almost 12V. Have even cleaned and checked the ignition barrel. At one stage the starter motor went silent. Have also tested and checked relay 109. So sorry for the diatribe but what do I do next? Quote Share this post Link to post Share on other sites
VAG-hag 0 Posted July 29, 2014 Vag com mate, see if its throwing a code out Quote Share this post Link to post Share on other sites
Atki 0 Posted July 29, 2014 Last time it was on ( Saturday ) it told me that it was a revolution sensor. I have since changed both of them now. Quote Share this post Link to post Share on other sites
fla 9 Posted July 29, 2014 Connection to coilpack ok? If you're getting fuel there the 109 relay should be ok. If you're not getting a spark work back from the spark plugs ie check leads, coilpack, power to coilpack, loom to coilpack. Let us know how you get on. Quote Share this post Link to post Share on other sites
Atki 0 Posted July 29, 2014 Hi. I'll try again tomorrow. Pretty sure there are sparks but only on the first turn over. Thats when it almost kicks in. Quote Share this post Link to post Share on other sites
Atki 0 Posted July 29, 2014 In one of the threads in the engine bay section someone mentioned the ecu needing to be re-mapped if the battery had been disconnected. How can you get that checked and would the re-mapping be easy to do? Or is it a case of VW only Quote Share this post Link to post Share on other sites
robrado974 1 Posted July 30, 2014 It doesn't have to be remapped , that's for better fuel consumption , better Bhp etc . It's something to do with resetting the ecu . Someone will come up with the answer how on how to do this . When the battery goes flat or is disconnected and is connected the ecu can go a bit nuts for a bit resetting itself . I've never reset mine in the past , just put the battery back in and let it sort itself out . Never been a problem . Quote Share this post Link to post Share on other sites
fendervg 29 Posted July 30, 2014 It's in the wiki - VR6 ECU reset procedure under Engine. Quote Share this post Link to post Share on other sites
plateletboy 0 Posted July 30, 2014 Mine did this on and off fro years - at the most inopportune moments. It was the ECU power relay in the end. changed it and never looked back. Fuel pump relay can give similar symptoms too Quote Share this post Link to post Share on other sites
